Always showing excitement about gold (7)
I believe the answer is:
forever
'always' is the definition.
(thesaurus)
'excitement about gold' is the wordplay.
'excitement' becomes 'fever' (fever is a kind of excitement).
'about' is an insertion indicator.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'fever' placed around 'or' is 'FOREVER'.
'showing' acts as a link.
(Other definitions for forever that I've seen before include "Till hell freezes over" , "always" , "as diamonds are" , "till Doomsday" , "continually" .)